Blood

Blood is used to transport nutrients through the body of a multicellular organism. In the case of humans, it uses a compound called haemoglobin and hormones to transport Oxygen to the cells. Because of cellular respiration, every single cell in the human body needs oxygen, so blood must deliver oxygen to every cell in the body. This is most likely true to most of the other Covenant races, with the exception of the Unggoy, though their blood may be delivering a different compound to the body, resulting in its difference in color to human blood.

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When shot without the protection of an energy shield, the target will "bleed." In some races, the blood will visibly come out of the target, and leave a stain on the ground. The viscosity and color of the blood varies by race.

As in reality, Humans will bleed red blood when shot. Forerunner artifacts, such as the Menachite Forerunner Complex, may at times be manipulated by human blood.[6] The Flood will always bleed a pasty, brownish-green color, and the explosion of a Carrier Form or an Infection Form will leave a brown stain on the ground. In gameplay, however, Infection forms do not "bleed," but rather explode into bits of flesh.

The blood and the amount of blood of Covenant foes changes during the course of the three Halo games. For example, Unggoy, Sangheili, Mgalekgolo and Kig-Yar bled profoundly when meleed in Halo: Combat Evolved, and yet, in Halo 2, the player must shoot the corpse in order for it to bleed. In Halo 3, the amount of blood is lessened dramatically, but is given in greater detail. Unggoy blood also seems more viscous, as opposed to slightly watery looking in the earlier games.

In Halo 3, when a Jiralhanae is shot and blood is spilled, there seems to be odd luminous chunks in the blood. You can see this in human blood as well.

Sometimes in Halo: Combat Evolved on the Xbox, the game will lag if too many blood decals are being rendered.

The Jiralhanae are the only race to have significantly different colored blood from one game to another, although in some Halo Legends episodes, other species also have different blood color than the games.

↑Halo: First Strike, page 141: Fred felt a hot pain in the tip of his finger. He drew his bare hand away and a tiny track of blood smeared the rock. The glittering symbols on the wall took on a greasy cast(..)